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【CSharp】获取本机可用端口

作者:dezai / 发布于2014/7/28/ 589

当我们要创建一个Tcp/UDP Server connection ,我们需要一个范围在1000到65535之间的端口。但是本机一个端口只能一个程序监听，所以我们进行本地监听的时候需要检测端口是否被占用。命名空间System.Net.NetworkInformation下定义了一个名为IPGlobalProperties的类，我们使用这个类可以获取所有的监听连接，然后判断端口是否被占用.


	//-----------------------------------------------------------------------------
	// Filename: FreePort.cs
	//
	// Description: Helper methods to find the next free UDP and TCP ports.
	//
	// History:
	// 28 Mar 2012 Aaron Clauson Copied from http://www.mattbrindley.com/developing/windows/net/detecting-the-next-available-free-tcp-port/.
	//-----------------------------------------------------------------------------

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Net;
	using System.Net.NetworkInformation;
	using System.Text;
	using System.Threading;

	namespace SIPSorcery.Sys.Net
	{
	 public class FreePort
	 {
	 private const string PortReleaseGuid = "8875BD8E-4D5B-11DE-B2F4-691756D89593";

	 /// <summary>
	 /// Check if startPort is available, incrementing and
	 /// checking again if it's in use until a free port is found
	 /// </summary>
	 /// <param name="startPort">The first port to check</param>
	 /// <returns>The first available port</returns>
	 public static int FindNextAvailableTCPPort(int startPort)
	 {
	 int port = startPort;
	 bool isAvailable = true;

	 var mutex = new Mutex(false,
	 string.Concat("Global/", PortReleaseGuid));
	 mutex.WaitOne();
	 try
	 {
	 IPGlobalProperties ipGlobalProperties =
	 IPGlobalProperties.GetIPGlobalProperties();
	 IPEndPoint[] endPoints =
	 ipGlobalProperties.GetActiveTcpListeners();

	 do
	 {
	 if (!isAvailable)
	 {
	 port++;
	 isAvailable = true;
	 }

	 foreach (IPEndPoint endPoint in endPoints)
	 {
	 if (endPoint.Port != port) continue;
	 isAvailable = false;
	 break;
	 }

	 } while (!isAvailable && port < IPEndPoint.MaxPort);

	 if (!isAvailable)
	 throw new ApplicationException("Not able to find a free TCP port.");

	 return port;
	 }
	 finally
	 {
	 mutex.ReleaseMutex();
	 }
	 }

	 /// <summary>
	 /// Check if startPort is available, incrementing and
	 /// checking again if it's in use until a free port is found
	 /// </summary>
	 /// <param name="startPort">The first port to check</param>
	 /// <returns>The first available port</returns>
	 public static int FindNextAvailableUDPPort(int startPort)
	 {
	 int port = startPort;
	 bool isAvailable = true;

	 var mutex = new Mutex(false,
	 string.Concat("Global/", PortReleaseGuid));
	 mutex.WaitOne();
	 try
	 {
	 IPGlobalProperties ipGlobalProperties =
	 IPGlobalProperties.GetIPGlobalProperties();
	 IPEndPoint[] endPoints =
	 ipGlobalProperties.GetActiveUdpListeners();

	 do
	 {
	 if (!isAvailable)
	 {
	 port++;
	 isAvailable = true;
	 }

	 foreach (IPEndPoint endPoint in endPoints)
	 {
	 if (endPoint.Port != port)
	 continue;
	 isAvailable = false;
	 break;
	 }

	 } while (!isAvailable && port < IPEndPoint.MaxPort);

	 if (!isAvailable)
	 throw new ApplicationException("Not able to find a free TCP port.");

	 return port;
	 }
	 finally
	 {
	 mutex.ReleaseMutex();
	 }
	 }
	 }
	}

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　本机　　可用端口　

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